Multi-ply paper



Jur. 27, 1933. J, H. 'sPoHN. JR

MULTI-PLY PAPER Filed Dec. 20, 1926 2 Shee ts-Sheec 1 FIEE :L.

n x m M M? NH W June 27, 1933. H HN, JR 1,915,626

MULTI- PLY PAPER Filed Dec. 20, 1926 2 Sheets-Sheet 2 v 5 Carat? Dd?Jet/10 Paper Jaw/y A! j va/y dz.

' edges of packing Patented June 27, 1933 UNITED? STATES PATIENT)o-Fncr.

JOHN H. SPOHN, JR., OF SAN OPME'NT CO. LTD., OF SAN FRANCISCO,CALIFORNIA,

FOB-NIA Application filed January 28, 193i.

relates to multi-ply paper,

The invention fiber board for use in the paper board or manufacture ofcartons and packing boxes and as a reinforcing band or strip along theboxes and cartons. The

' ma'or portion of the paper and paperboard which the grain of the paperexten s direction of sheet. The result is a paper which is used forwrapping and packing purposes is formed in awcontinuous web on papermachines. The paper manufactured on these machines has a verydefinitegrain in the the length of the web or sheet due to the fact thatin the process of manufacture, the fibers which form the paper or paperboard become more or less alined 1n the direction of the length of theweb or having a verg definite grain .in the direction of the lengt ofthe sheet thereby reducing the resistance of the paper to rupturing,cracking or tearing along a line extending in the direction of thelength of the sheet. When such paper or aper board is employed in themanufacture of cartons and packing cases it presents -a decided weaknessalong a line parallel to the length of the sheet, so that the box orcarton possesses a minimum of strength in that direction. This weaknessis particularly noticeable along the edges of the packing case at d inthe same direction as the edge. At this'point, the paper is readilycracked or ruptured and the result is a very unsatisfactory situation.

In accordance with my invention, I produce a long strip or sheet ofpaper or havin an increased resistance to rupturing, crackmg or tearingalon a line extending in the direction of the length of the strip orsheet, so that when this strip or sheet is used inthe formation of apacking box, asreinforcement alon the edges,'the edges are not morevulnerab e than any other part of the packing case. An object of myinvent on therefore is to produce a long paper strip having increasedreslstance to rupturing,

cracking ortea-ring along a line extending in the direction of thelength of the strip and across the strip.

A further object is to provide a paper strip having substantially thesame resistance to tearing in all directions or in other words, a

FRANCISCO, CALIFORNIA, ASSIGNOR '10 CHEMICAL paper board a or is used-DEVEL- a ooarona'non or GALI- Serial No. 511,887.

paper strip in which the effect of the grain of the fiber has beeneliminated.

The invention possesses other advantageous features, some of which, withthe fore going will be set forth at length in the following description,where I shall outline in full that form of the invention which I haveselectedfor illustration in the drawings accompanying and forming .partof the present specification. Insaid drawings, I have shown one form ofmaterial embodying my invention, but it is to be understood that I donot limit myself to such form, since the invention, as set forth in theclaims, may be embodied in a plurality of forms.

Referring to said drawings, Figure 1 is a portion of a strip of paperembodying my invention, a portion of the upper layer of the strip beingomitted to better disclose the construction. V Figure 2 is a sideelevation on an exaggerated scale, of the strip shown in Figure 1.

Figure 3 is a portion of a strip of paper formed on a paper makingmachine, indicating the manner in which the paper is cut to form sheetswhich are subsequently combined to form the multi-ply paper of myinvention.

Figures 4 and 5 are diagrammatic showings of certain means formanufacturing the multi-ply paper of my invention.

The multii -ply paper or paper board of my invention comprises twolayers of paper or paper board sheets adhesively secured together, thefibers in the sheets formin one layer being disposed at an angle to the%bers in the sheets forming the other layer and the fibers'in bothlayers being disposed at an 'angle to the longitudinal axis of thestrip. The sheets 2 forming the upper layer are in the form ofparallelograms having included acute and obtuse angles and the fibers inthe sheets 2 lie principally in the direction of the length of thesheets. The longitudinal edges f the sheets, with which the fibers areprincipally parallel, are preferably arranged in substantial abutmentand-the end edges 4 of the sheet are alined and form the edge of themulti-ply strip, although the longitudinal edges may overlap whendesired. The side edges 3 preferably form an acute angle of 45 degreeswiththe side edges 4. The sheets 2a which form the lower layer of thestrip are arranged in the same manner as the sheets 2 their longitudinaledges 3a are in substantial abutment, and these edges form an acuteangle of substantially 45 degrees with the side edges 4a. The sheets 2ahowever are arranged so that the longitudinal edges 3a are substantiallyat right angles to the longitudinal edges 3, so that the fibers in thesheets 2a are substantially at right angles to the fibers in the sheets2. The sheets 2- and 2a forming the two layers are adhesively securedtogether by glue or any other desirable adhesive. The result is a longpaper strip of any desired width in which the effect of fiber grainhasbeen eliminated or neutralized by forming the strip so that thefibers in one ayer are at right angles to the fibers in the other layer,and so that all of the fibers are at an angle, preferably an angle of 45degrees to the longitudinal axis of the strip. A paper strip of thischaracter has no particular directional weakness, so that it lendsitself admirably for the manufacture of articles which are subjected tostrains in various directions. While I have herein referred to a two-plystrip, it is to be understood that the strip may compose two or moreplys, with the fibers in each ply at'an angle to the fibers in thecontiguous ply.

The strip may be made in any desired manner. The sheet of paper as it ismade on the paper machine may becut on the bias as shown in Figure 3 andthe separate sections arranged by a'suitable machine so that they assumethe relationship shown in Figure 1. The adhesive is applied between thetwo, layers and pressure to cause firm adhesion of the two layers. a

When desired, the strip may be first formed as a tube, as in themanufacture of paper tubes as is shown in Figure 4, by rotatin twospools 11 of the paper around a cylindrical mandrel 12 andsifnaltaneously advancing the tube thus formed on the mandrel. At thesame time an adhesive is applied by applying means indicated at 13 tocause the overlying strips to be secured together. After being formed onthe mandrel, a length of the tube is cut off by the cut-off means 14.The tube is then slit longitudinally by slitting means 16 and opened outand rolled flat by the means indicated at 17.

hesive having sequent .of the strip com the multi-ply strip is subjectedto lelograms forming the other layer are parallel to each other andcross the longitudinal edges of the parallelograms of the firstmentioned layer.

A further method, as is shown in Figure 5, comprises winding a singlestrip 21 of paper, either wet or dry, around a mandrel 22, either roundor flat, and then flattening and pressing the tube thus formed, asuitable adbeen introduced into the tube to cause the opposite sides toadhere. These last operations are secured by thecut-off means 23 whichsevers a length of tube from that on the mandrel for subflattcning bytube flattening means 24. An adhesive is applied to the inside of thetube prior to flattening so that the inner faces of the flattened tubeadhere. The strip of paper is preferably wound upon the mandrel with aslight overlap as at 26 so that the single strip tube preserves itsform, after being removed from the mandrel. Adhesive is applied by theapplying means 27' so that the overlap is maintained. 4

The resultis a multi-ply strip, each layer rising a series ofparallelograms, but di ering from the previously described constructionin that the parallelograms' of both layers form part of a continuousfolded strip of paper.

I claim:

1. The method of forming a flat multi-ply paper board comprisingsupplying a strip of paper to a rotating member, supplying a secondstrip of paper to said member, said second strip being suppliedangularly. with respect to the first strip and to the member, securingsaid strips together to form a tube upon the member, removing the tubefrom the member, and forming the tube into a flat paper board.

2. The method of forming a flat multi-ply paper board comprising forminga tube of several angularly positioned paper strips, and deforming thetube into a flat multi-ply paper board.

In testimony whereof, I have hereunto set In hand.

y JOHN H. SPOHN, JR.

